The dipper fell with a splash that was plainly heard both by herself and those in the pursuing boat.
"Out there he is!" cried a voice in the other boat.

She heard the pursuers head out.

Harriet took advantage of the opportunity to move her rowboat ahead a few rods.

She then turned it sharply to the shore.
The girl was fortunate in being able to find cover in the overhanging foliage, behind which she took refuge.

The water was quite shallow there.